<!DOCTYPE html>
<svg>
  <clipPath id="nested">
    <path d="M0,0h100z"/>
  </clipPath>
  <clipPath id="clip" clip-path="url(#nested)">
    <rect width="100" height="100"/>
  </clipPath>
  <rect width="100" height="100" fill="green"/>
  <rect width="200" height="100" fill="red" clip-path="url(#clip)"/>
</svg>
